The upcoming feature update to Windows 10, the Fall Creators Update, will see many legacy features in Windows getting removed or deprecated: the most noticeable among them being the classic Paint program, System Image Backup and screensaver functionality, amongst others.
https://www.notebookcheck.net/Paint-and-other-legacy-features-to-get-axed-in-the-Windows-10-Fall-Creators-Update.237006.0.html
Removing Reader app? Seriously? It's one of the best things to come out of Microsoft in the last few years. Native stylus support, super fast (unlike Adobe Reader), decent UI (though weird to get used to without a touchscreen) - Edge in no way can replace it, I just tried.